Ouch, do they know what is causing the gastritis? If you have comfort foods you will probably feel worse because most comfort foods are high in fat, requiring bile production (pancreas) and release (gall bladder) so if you do have gall stones this is going to irritate it and make you feel even worse. Solution? Sw comfort foods. Pretty high on my list is curried shepherd's pie, but it could be whatever you find comforting, there will be a way to make it low fat and filling. Mashed potato is simply utter comfort to me. It shouldn't irritate your gastritis either. Stay away from anything acidic though, like citrus fruits.